Shaving unit for safety razor

ABSTRACT

The specific disclosure provides a shaving unit having a spacer which includes a pair of spaced forwardly extending projections. A bottom razor blade is connected to the underside of the spacer with its cutting edge positioned beneath the projections, and a top razor blade is connected to the upperside of the spacer with its cutting edge positioned above the projections and rearwardly of the cutting edge of the bottom blade.

United States Patent Ferraro 1 Jan. 7, 1975 [54] SHAVING UNIT FOR SAFETYRAZOR 3,783,510 1/1974 Davitidowicz 30/50 X Inventor: Frank A. Ferraro,Trumbull, Conn. 3,786,563 1/1974 Donon 4. 30/50 [73] Assignee:Warner-Lambert Company, Morris FOREIGN PATENTS B APPLICATIONS Plains NHL772,532 4/1957 Great Britain 30/50 [22] Filed: Sept 1973 PrimaryExaminerAl Lawrence Smith 2 App] 39 104 Assistant ExaminerGary L. SmithAttorney, Agent, or Firm.lames F. Powers, Jr.; Albert 0 H. Graddis [30]Foreign Applicatlon Prlorlty Data Jan. 23, 1973 Great Britain 3365/73[57] ABSTRACT 52 us. 01. 30/346.58, 30/50 The Specific disclosure PmhdeSa Shaving having 51] Int. Cl B2611 21/54, B26b 21/22 a Spacer whichincludes a Pair of Spaced forwardly [58] Field of Search 30/50 346.57346.58 tending Pmiechohs- A bottom razor blade is 36/341659 nected tothe underside of the spacer with its cutting edge positioned beneath theprojections, and a top [56] References Cited razor blade is connected tothe upperside of the spacer with its cutting edge positioned above thepro- UNITED STATES PATENTS jections and rearwardly of the cutting edgeof the bot- 2,019,475 11 1935 Baudis 30134 .59 x tom blade 2,713,2017/1955 Plesch 30/346.57 X 3,262,206 7/1966 Tomek 30/3465) 21 Claims, 13Drawing Figures Patented Jan. 7, 1975 3,858,315

3 Sheets-Sheet 1 l9 f r w imi in 3Z /5 Patented Jan. 7, 1975 3,858,315

3 Sheets-Sheet 2 Patented Jan. 7, 1975 3 Sheets-Sheet SHAVING UNIT FORSAFETY RAZOR BACKGROUND OF THE INVENTION 1. FIELD OF THE INVENTION Thepresent invention relates to shaving units having a plurality of cuttingedges for use in a safety razor. More particularly, the presentinvention relates to shaving units for safety razors with the shavingunits having a plurality of single cutting edge blades bonded togetheron opposite sides of a spacer such that the cutting edges are tandemlyarranged.

2. DESCRIPTION OF THE PRIOR ART Shaving systems which provide forfeeding single cutting edge blades to a safety razor from a separabledispenser are well known in the art and are commercially available. Forexample, dispensers such as described in U.S. Pat. Nos. 2,911,713 and2,812,576 have an elongated key that is positioned in the head of asafety razor such as disclosed in US. Pat. Nos. 2,911,713, 2,911,714,3,128,551 and 3,177,581 to wedge a cap in the razor head away from ablade seat. A fingeroperated slide on the dispenser is then used toinsert a blade between the cap and blade seat. After the key is removedfrom the razor head, the cap acts to clamp the blade to the blade seatand to bias the cutting edge of the blade forwardly against a pair ofspaced stops on the blade seat or cap.

Tomek US. Pat. No. 3,262,206 describes a shaving unit consisting of apair of tandemly mounted single cutting edge blades which are verticallyseparated by a plastic spacer having a forward surface spaced inwardlyfrom both cutting edges. The plastic spacer of Tomek has plastic postsextending through perforations in the two blades to bond the bladesthereto. Thus, when the shaving unit of Tomek is clamped and biasedagainst stops in the above-described razors, the portions of the lowerblade cutting edge can break down around the stops to cause an unwantedincrease in shave angles with regard to a typical guard bar surfacelocated downwardly and outwardly from the cutting edges. Further, thestructure of Tomek raises the possibility of planar movement of thespacer and top blade as a result of shear forces resulting from thebiasing action in the razor head to seat the unit against stops.

SUMMARY OF THE INVENTION wherein the razor comprises means for locatingthe shaving unit and means for biasing the shaving unit to said locatingmeans. The shaving unit comprises a razor blade having a cutting edgepositioned upwardly and rearwardly of a cutting edge on another razorblade. Means interconnect the two blades for vertically spacing theblades apart, and means extend forwardly from the spacing means to atleast the cutting edge of the lower blade for abutting engagement withthe locating means. This aspect of the invention avoids or minimizes thepossibility of cutting edge breakdown because the abutting engagementmeans absorbs the forces applied to the forward portion of the unit whenthe unit is biased to the locating means.

In accordance with another aspect of the invention, the spacing means ofthe preceding aspect includes rear surface means for abutting engagementwith the biasing means whereby the adverse effects of shear forcesapplied to the blades and spacer are avoided or minimized.

In accordance with still another aspect of the present invention, thereis provided a shaving unit comprising a spacer member including a pairof spaced forwardly extending projections. A first razor blade isconnected to an underside of the spacer member, and includes a cuttingedge positioned beneath the projections. A second razor blade isconnected to an upperside of the spacer member, and includes a cuttingedge positioned above the projections and rearwardly of the cutting edgeof the first razor blade. The projections absorb the forces applied tothe forward portion of the unit when the unit is seated in a safetyrazor.

In accordance with yet another aspect of the present invention, thespacer member of the immediately preceding aspect further includes asurface extending rearwardly to at least the rearmost portions of thefirst and second razor blades whereby the adverse effects of shearforces applied to the unit are avoided or minimized.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded view of anembodiment of a shaving unit constructed in accordance with the presentinvention;

FIG. 2 is a top plan view of the shaving unit embodiment of FIG. 1;

FIG. 3 is a cross-sectional view of the shaving unit taken along Lines3-3 of FIG. 2;

FIG. 4 is a cross-sectional view of another embodiment of a shaving unitconstructed in accordance with the present invention;

FIG. 5 is a cross-sectional view of an embodiment of the presentinvention taken along Lines 5,5 of FIG. 6;

FIG. 6 is a top plan view of an embodiment of the invention showingblade and spacer orientation means;

FIG. 7 is a cross-sectional view of an embodiment of the invention forbonding the blades and spacer to gether;

FIGS. 8 and 9 are cross-sectional views showing another embodiment forbonding the blades to a plastic spacer;

FIG. 10 is a cross-sectional view of the FIG. 1 embodiment seated in asafety razor;

FIG. 11 is an exploded view of yet another embodiment of a shaving unitconstructed in accordance with the present invention;

FIG. 12 is a top plan view of the embodiment of FIG. 11; and

FIG. 13 is a cross-sectional view taken along Lines 13-43 of FIG. 12.

DESCRIPTION OF SPECIFIC EMBODIMENTS With reference to FIGS. 1 3, oneembodiment of the present invention provides a shaving unit 10 having atop single edge razor blade 11 and a bottom single edge razor blade 13connected to opposite surfaces of a spacer member 12. The spacer member12 has a pair of spaced forwardly extending projections l7, 18 at theouter ends thereof, and a plurality of forwardly extending teeth 16between the projections l7, 18. The cutting edge l5 of the bottom blade13 is positioned beneath the projections 17, 18, and the cutting edge 14of the top blade 11 is positioned above the projections 17, 18 andrearwardly of the cutting edge 15 of the bottom blade 13.

As shown in FIG. 3, the forward extension of the teeth 16 is terminatedshort of the cutting edge 14 of the top blade 11. However, the uppersurfaces of the teeth 16 can alternatively be beveled, and the beveledsurfaces can then extend forwardly a slight distance from beneath thecutting edge 14 of the top blade 11. Spaces 19 formed between the teeth16 are in fluid communication with elongated perforations 20 formed inthe bottom blade 13. The spaces 19 and the perforations 20 provideshaving residue flow paths from be tween the cutting edges 14, 15 of theblades 11, 13.

The blades l1, l3 and the spacer member 12 have a pair of spacedelongated slots which may be used as an aid to handling materials andthe blades ll, 13 and spacer member 12 during manufacture and assemblyof the shaving unit 10. Each one of the blades 11, 13 and the spacermember 12 has a cut-out portion 8 at each end thereof. During assemblyof the shaving unit 10, the cut-out portions 8 are aligned as shown inFIG. 2 to orient the blades 11, 13 and the spacer member 12 prior tobonding the blades l1, 13 to the spacer member 12.

In the embodiment shown in FIGS. 1 3, the blades 11, 13 are bonded tothe spacer member 12 by a plurality of spot welds 22. Alternatively, thespacer member 12 can have a plurality of upwardly extending anddownwardly extending projections having a height of approximately 0.003inch. In this alternative embodiment, the blades 11, 13 are bonded tothe spacer member 12 by a projection welding process such as describedin Metals Handbook, Vol. 6 Welding and Brazing, Page 445, AmericanSociety for Metals, Metals Park, Ohio 44073, 1971.

FIG. 4. is a modification of the embodiment of FIGS. 1 3 wherein theprojections 17, 18 of FIGS 1 3 are upwardly deformed to provide stops 23against which the outer ends of the cutting edge 14 of the top blade 11are seated. The stops 23 may be used as an aid to orient the top bladecutting edge 14 with respect to the spacer member 12 and the bottomblade cutting edge 15. Further, the stops 23 prevent nicks and cuts fromthe outer corners of the top blade cutting edge 14.

FIGS 5 and 6 show another modification of the embodiment of FIGS 1 3wherein the spacer member 12 has a pair of upwardly extending posts 31,35 which are located in the outer portions of the top blade slots 30,33, and a pair of downwardly extending posts 32, 34 which are located inthe innermost portions of the bottom blade slots. The posts 31, 32, 34,35 are used to orient the blades 11, 13 with respect to the spacermember 12.

FIG. 7 shows another embodiment of the present invention wherein the topand bottom blades 11, 13' have a plurality of beveled holes 40, 41. Thespacer member 12' is upwardly and downwardly deformed 46, 48 by a punchor the like inserted through holes 45, 47 to form relatively flat-headedrivets 43, 44 in the beveled holes 40, 41.

FIGS. 8 and 9 show another embodiment of the present invention whereinthe spacer 50 is formed of plastic and has a plurality of posts 51, 52extending upwardly and downwardly through beveled holes 53, 54 formed inthe top and bottom blades 11", 13". The posts 51, 52 are staked orcompressed in any known manner, such as by ultrasonics, heat and/orpressure, to fill out the beveled holes 53, 54 as shown in FIG. 9.

With reference to FIGS 11 13, the shaving unit 79 has equallydimensioned top and bottom blades 81, 82. The only difference betweenthe top and bottom blades is that the top blade 81 distance between therear edge 84 and the cut-out portions 98 is less than the bottom blade82 distance between its rear edge 85 and its cutout portions 100. Theblades 81, 82 and the spacer have a pair of elongated slots 95, 96, 97which may be used for handling the components during manufacture. Theunit 79 of FIGS 11 13 is assembled by aligning the cut-out portions 98,99, 100 of the blades 81, 82 and the spacer 80, and the blades 81, 82are then bonded to the spacer member 80 by a plurality of spot weldsdiagrammatically represented as 90, 92, 94 or by projection welding suchas described hereinabove with respect to the embodiment of FIGS 1 3.

The cutting edge 89 of the bottom blade 82 is positioned beneath theprojections 86, 87 of the spacer, and the cutting edge 88 of the topblade 81 is positioned above the projections 86, 87 and rearwardly ofthe bottom blade cutting edge 89. The rear edge 83 of the spacer 80extends rearwardly of the rear edges 84, 85 of the blades 81, 82.

The projections 86, 87 can be deformed as shown in FIG. 4 to providestops for the top blade cutting edge 88. Alternatively, the forwardlyextending projections of any one of the foregoing embodiments can haveupwardly extending portions spaced from the upper blade cutting edge,but situated with respect to the upper blade cutting edge to precludenicks and cuts by the corners of the upper blade cutting edge.

The shaving units of the present invention can be dispensed from amodified form of well-known and commercially available single edge bladedispensers. Single edge blade dispensers are described in many patentssuch as U.S. Pat. Nos. 2.9l1,7l3 and 2,812,576. The dispensermodifications essentially consist of thickening an elongated key of thedispenser such that a cap portion of the razor head is wedged away froma blade seating plate of the razor to permit insertion of the shavingunit between the cap portion and the seating plate. It is also apparentthat a blade exit slot of the well-known single edge blade dispensermust be dimensioned to permit removal of shaving units therefrom underthe action of a finger-operated pusher.

FIG. 10 is a cross-sectional view of a head 60 of a single edge razorcurrently manufactured by the Schick Safety Razor Company, Division ofWarner-Lambert Company. The razor shown in FIG. 10 functions essentiallyin the same manner as the razor disclosed in the US. Pat. No. 2,911,713, which patent is incorporated herein by reference.

With reference to FIG. 10, the razor head 60 has a frame member 61having a forwardly extending cap in transverse line contact with the topblade 11 at point 65. From point 65, the underside of the cap is beveledat 66 away from the top blade 11. The head 60 also includes a bladeseating plate having a generally flat forwardly projecting flange 69underlying the cap of the frame 61 to constitute the blade seat for theshaving unit. The seat 69 terminates along its front edge in adownwardly curved serrated guard bar 63. Behind the guard bar 63 is aclearance opening 64 formed in the seat 69. An upwardly extending bladestop 62 is formed on the seat 69 at each end of the guard bar 63. Thestops 62 each have a vertical surface 68 against which the forwardlyextending projections 86, 87 are biased.

At least one indent 67 is formed in the frame 61 for abutting engagementwith the rear edge of the spacer member 12. As described in US. Pat. No.2,911,713, an upper part of a spring 71 bears against a flange portion70 of the blade seating plate to clamp the seat 69 both upwardly andrearwardly such that the shaving unit is firmly clamped between the capline-contact 65 and the seat 69, and biased forwardly against thevertical surfaces 68 of the spaced stops 62 by the indent 67.

Suitable dimensions for the razor head are shown in FIG. 10. Thehorizontal distance between the cutting edges of the blades shown ineach one of the foregoing embodiments is preferably between about 0.035to about 0.055 inches, and the vertical distance between the cuttingedges of the two blades is preferably between about 0.010 to about 0.026inches. Suitable dimensions for the embodiment of the shaving unit shownin FIGS 1 3 are provied in FIG. 10.

The shaving unit of FIGS. 11 13 can be suitably constructed of 0.006inch by 1.50 inch by 0.29 inch razor blades 81, 82, and a spacer member83 having a thickness or vertical height as viewed in FIG. 13 of0.01inch. Further, the horizontal distance between the cutting edges 88, 89can be 0.036 inch, and the spacer rear edge 83 can suitably protruderearwardly from the top blade rear edge 84 by 0.01 inch. Still further,the upwardly extending portions (not shown) on the projections 86, 87discussed hereinabove can suitably extend upwardly 0.005 inch to avoidnicks and cuts from the corners of the top blade cutting edge 88.

As used herein, positioning the bottom blade cutting edge beneath" thespacer projections includes positioning the bottom blade cutting edge ina vertical plane as defined by the forwardmost portions of theprojections. It is also contemplated that the spacer projections canextend forwardly of the bottom blade cutting edge. This aspect of theinvention requires that the projections come into abutting engagementwith the vertical surfaces of blade locating stops which are shown inFIG. as extending upwardly from the blade seat 69, and which are shownin US. Pat. No. 3,177,581 as extending downwardly from a cap portion ofa razor head. As discussed above, this aspect of the invention avoids orminimizes the possibility of the bottom blade cutting edge breaking downas a result of abutting engagement with blade stops on a razor.

Similarly, another aspect of the invention contemplates that the rearedges of the blade not extend rearwardly of a vertical plane defined bythe rear edge of the spacer. For example, the blade rear edges may liein a vertical plane defined by the spacer rear edge as shown in FIG. 3,or one or more of the blade rear edges may be forward of the spacer rearedge as shown in FIG. 13. As discussed hereinabove, this aspect of theinvention calls for the rear surface of the spacer coming into abuttingengagement with biasing means such that in combination with the firstabstract the adverse effects of shear forces are avoided or minimized.

The present invention also contemplates more than two single edge bladestandemly arranged such that seating and shear forces are absorbed by atleast one spacer member.

What is claimed is:

l. A replaceable shaving unit for a safety razor, wherein said razorcomprises a transverse guard surface, spaced stop means for locatingsaid shaving unit with respect to said guard surface, a blade seatmember, and means for clamping said shaving unit on said blade seatmember and for biasing said shaving unit to said spaced stop means, saidshaving unit comprising:

a. a first razor blade having a cutting edge and a blunt rear edgeadapted to be positioned upwardly and rearwardly of said guard surface,and an underside for abutting engagement with said blade seat member,

b. a second razor blade having a cutting edge and a blunt rear edgepositioned upwardly and rearwardly of said first razor blade,

c. means interconnecting said first and second razor blades forvertically spacing said first and second razor blades apart, saidspacing means including rear surface means extending rearwardly to atleast the blunt rear edges of said bottom and top razor blades forabutting engagement with said biasing means, and

d. means extending forwardly from said spacing means to at least thecutting edge of said first razor blade for abutting engagement with saidspaced stop means.

2. A replaceable shaving unit for a safety razor, wherein said razorcomprises a transverse guard surface, spaced stop means for locatingsaid shaving unit with respect to said guard surface, a blade seatmember, a frame member including a cap extending forwardly above saidblade seat member, and means for biasing said shaving unit in abuttingengagement with said stop means and said blade seat member upwardly toclamp said shaving unit between said cap and said blade seat member,said shaving unit comprising;

a. a spacer member including a transversely elongated center portionhaving a rear surface for abutting engagement with said frame member, apair of spaced projections extending forwardly from said center portionfor abutting engagement with said spaced stop means, an underside, andan upper side;

b. a bottom razor blade connected to said underside, said bottom razorblade including a lower surface for abutting engagement with said bladeseat member, an elongated cutting edge positioned beneath saidprojections, and a blunt rear edge positioned beneath said centerportion; and

c. a top razor blade connected to said upper side, said top razor bladeincluding an upper surface for abutting engagement with said cap, anelongated cutting edge positioned above said projections and rearwardlyand parallelly with the cutting edge of said bottom razor blade, and ablunt rear edge positioned above said center portion;

(1. said spaced projections extending forwardly to a least a verticalplane defined by the cutting edge of the bottom blade; and

e. said rear surface of said center portion extending rearwardly of theblunt edges of said bottom and top blades.

3. The shaving unit of claim 2, wherein said spacer member furtherincludes a plurality of teeth between said projections, said teethextending forwardly from said center portion for a distance less thanthe forward extension of said projections.

4. The shaving unit of claim 3, wherein said bottom razor blade furtherincludes a plurality of perforations between said teeth.

5. The shaving unit of claim 2, wherein each one of said projectionsincludes an upwardly extending surface; and wherein the cutting edge ofsaid top razor blade is seated against the upwardly extending surfaceson said projections.

6. The shaving unit of claim 2, wherein each one of said bottom and toprazor blades further includes a transversely elongated slot, the slotsbeing vertically aligned; and wherein said spacer member furtherincludes a pair of transversely spaced posts, one of said postsextending upwardly into one end of the slot in said top razor blade, andthe other of said posts extending downwardly into the end of the slot insaid bottom razor blade opposite said one end.

7. The shaving unit of claim 6, wherein each one of said bottom and toprazor blades further includes another transversely elongated slot, theanother slots being vertically aligned; and wherein said spacer memberfurther includes another pair of transversely spaced posts, one of saidanother posts extending upwardly into one side of the another slot insaid top razor blade, and the other of said another posts extendingdownwardly into the side of the another slot in said bottom razor bladeopposite said one side.

8. The shaving unit of claim 2, wherein said bottom and top razor bladeseach has an equal distance from cutting edge to blunt rear edge.

9. The shaving unit of claim 2, wherein said bottom and top razor bladeshave identical length, width and height dimensions.

10. The shaving unit of claim 9, wherein each one of said bottom and toprazor blades has a height of 0.006 inch, and wherein said spacer memberhas a height of 0.01 inch.

11. The shaving unit of claim 10, wherein the cutting edge of said toprazor blade is in a horizontal plane 0.016 inch above another horizontalplane defined by the cutting edge of said bottom razor blade.

12. The shaving unit of claim 11, wherein a pair of vertical planesdefined by the cutting edges of said bottom and top razor blades have aspacing therebetween of about 0.035 inch to about 0.037 inch.

13. The shaving unit of claim 2, wherein said bottom and top razorblades are connected to said spacer member by a plurality of spot welds.

14. The shaving unit of claim 2, wherein said bottom and top razorblades are connected to said spacer member by a plurality of projectionwelds, the weld projections being initially formed on said spacermember.

15. The shaving unit of claim 2, wherein each of said bottom and toprazor blades further includes a plurality of apertures, and wherein saidcenter portion of said spacer member is deformed through said aperturesto connect said bottom and top razor blades to said spacer member byintegral rivets.

16. the shaving unit of claim 2, wherein each of said bottom and toprazor blades further includes a plurality of apertures, and wherein saidcenter portion of said spacer member has a plurality of posts extendingthrough said apertures, said posts being deformed at the outer endsthereof to connect said bottom and top razor blades to said spacer.

17. The shaving unit of claim 2, wherein the cutting edge of said toprazor blade is in a horizontal plane from about 0.035 inch to about 0.55inch above another horizontal plane defined by the cutting edge of saidbottom razor blade.

18. The shaving unit of claim 17, wherein a pair of vertical planesdefined by the cutting edges of said bottom and top razor blades havinga spacing therebetween of from about 0.01 inch to about 0.026 inch.

19. The shaving unit of claim 2, wherein the distance between thecutting edge and the blunt rear edge of said top razor blade is lessthan the distance between the cutting edge and the blunt rear edge ofsaid bottom blade.

20. The shaving unit of claim 2, wherein the height of one of said topand bottom razor blades is less that the height of the other of said topand bottom razor blades.

21. The shaving unit of claim 2, wherein said projections extendforwardly of the cutting edge of said bottom blade.

1. A replaceable shaving unit for a safety razor, wherein said razorcomprises a transverse guard surface, spaced stop means for locatingsaid shaving unit with respect to said guard surface, a blade seatmember, and means for clamping said shaving unit on said blade seatmember and for biasing said shaving unit to said spaced stop means, saidshaving unit comprising: a. a first razor blade having a cutting edgeand a blunt rear edge adapted to be positioned upwardly and rearwardlyof said guard surface, and an underside for abutting engagement withsaid blade seat member, b. a second razor blade having a cutting edgeand a blunt rear edge positioned upwardly and rearwardly of said firstrazor blade, c. means interconnecting said first and second razor bladesfor vertically spacing said first and second razor blades apart, saidspacing means including rear surface means extending rearwardly to atleast the blunt rear edges of said bottom and top razor blades forabutting engagement with said biasing means, and d. means extendingforwardly from said spacing means to at least the cutting edge of saidfirst razor blade for abutting engagement with said spaced stop means.2. A replaceable shaving unit for a safety razor, wherein said razorcomprises a transverse guard surface, spaced stop means for locatingsaid shaving unit with respect to said guard surface, a blade seatmember, a frame member including a cap extending forwardly above saidblade seat member, and means for biasing said shaving unit in abuttingengagement with said stop means and said blade seat member upwardly toclamp said shaving unit between said cap and said blade seat member,said shaving unit comprising; a. a spacer member including atransversely elongated center portion having a rear surface for abuttingengagement with said frame member, a pair of spaced projectionsextending forwardly from said center portion for abutting engagementwith said spaced stop means, an underside, and an upper side; b. abottom razor blade connected to said underside, said bottom razor bladeincluding a lower surface for abutting engagement with said blade seatmember, an elongated cutting edge positioned beneath saId projections,and a blunt rear edge positioned beneath said center portion; and c. atop razor blade connected to said upper side, said top razor bladeincluding an upper surface for abutting engagement with said cap, anelongated cutting edge positioned above said projections and rearwardlyand parallelly with the cutting edge of said bottom razor blade, and ablunt rear edge positioned above said center portion; d. said spacedprojections extending forwardly to a least a vertical plane defined bythe cutting edge of the bottom blade; and e. said rear surface of saidcenter portion extending rearwardly of the blunt edges of said bottomand top blades.
 3. The shaving unit of claim 2, wherein said spacermember further includes a plurality of teeth between said projections,said teeth extending forwardly from said center portion for a distanceless than the forward extension of said projections.
 4. The shaving unitof claim 3, wherein said bottom razor blade further includes a pluralityof perforations between said teeth.
 5. The shaving unit of claim 2,wherein each one of said projections includes an upwardly extendingsurface; and wherein the cutting edge of said top razor blade is seatedagainst the upwardly extending surfaces on said projections.
 6. Theshaving unit of claim 2, wherein each one of said bottom and top razorblades further includes a transversely elongated slot, the slots beingvertically aligned; and wherein said spacer member further includes apair of transversely spaced posts, one of said posts extending upwardlyinto one end of the slot in said top razor blade, and the other of saidposts extending downwardly into the end of the slot in said bottom razorblade opposite said one end.
 7. The shaving unit of claim 6, whereineach one of said bottom and top razor blades further includes anothertransversely elongated slot, the another slots being vertically aligned;and wherein said spacer member further includes another pair oftransversely spaced posts, one of said another posts extending upwardlyinto one side of the another slot in said top razor blade, and the otherof said another posts extending downwardly into the side of the anotherslot in said bottom razor blade opposite said one side.
 8. The shavingunit of claim 2, wherein said bottom and top razor blades each has anequal distance from cutting edge to blunt rear edge.
 9. The shaving unitof claim 2, wherein said bottom and top razor blades have identicallength, width and height dimensions.
 10. The shaving unit of claim 9,wherein each one of said bottom and top razor blades has a height of0.006 inch, and wherein said spacer member has a height of 0.01 inch.11. The shaving unit of claim 10, wherein the cutting edge of said toprazor blade is in a horizontal plane 0.016 inch above another horizontalplane defined by the cutting edge of said bottom razor blade.
 12. Theshaving unit of claim 11, wherein a pair of vertical planes defined bythe cutting edges of said bottom and top razor blades have a spacingtherebetween of about 0.035 inch to about 0.037 inch.
 13. The shavingunit of claim 2, wherein said bottom and top razor blades are connectedto said spacer member by a plurality of spot welds.
 14. The shaving unitof claim 2, wherein said bottom and top razor blades are connected tosaid spacer member by a plurality of projection welds, the weldprojections being initially formed on said spacer member.
 15. Theshaving unit of claim 2, wherein each of said bottom and top razorblades further includes a plurality of apertures, and wherein saidcenter portion of said spacer member is deformed through said aperturesto connect said bottom and top razor blades to said spacer member byintegral rivets.
 16. the shaving unit of claim 2, wherein each of saidbottom and top razor blades further includes a plurality of apertures,and wherein said center portion of said spacer member has a plurality ofposts Extending through said apertures, said posts being deformed at theouter ends thereof to connect said bottom and top razor blades to saidspacer.
 17. The shaving unit of claim 2, wherein the cutting edge ofsaid top razor blade is in a horizontal plane from about 0.035 inch toabout 0.55 inch above another horizontal plane defined by the cuttingedge of said bottom razor blade.
 18. The shaving unit of claim 17,wherein a pair of vertical planes defined by the cutting edges of saidbottom and top razor blades having a spacing therebetween of from about0.01 inch to about 0.026 inch.
 19. The shaving unit of claim 2, whereinthe distance between the cutting edge and the blunt rear edge of saidtop razor blade is less than the distance between the cutting edge andthe blunt rear edge of said bottom blade.
 20. The shaving unit of claim2, wherein the height of one of said top and bottom razor blades is lessthat the height of the other of said top and bottom razor blades. 21.The shaving unit of claim 2, wherein said projections extend forwardlyof the cutting edge of said bottom blade.